In this context, an interesting novel approach was proposed by De Domenico et al. in their seminal work on multilayer networks [1]}. They have proposed a new framework in which it is possible to encode information about the different possible relations between the nodes of the system in different layers. Each of these layers represents a specific kind of relation between a set of nodes and can be considered as a partial representation of the whole system without the loss of a simple structure representation: for example, a sub-network describing a specific kind of relation between the nodes of the network, which again reflects some of the properties or the characteristics of the complex system. In this work we adopt a similar mathematical formulation to describe the transport system of an urban environment. To better describe the transport system of the city we are studying, in Section  we specifically model the network structure to best fit the city characteristics following the more general formulation discussed herein.
